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首页> 外文会议>Thermosense: thermal infrared applications XXXVI >Applications of infrared thermography for nondestructive testing of fatigue cracks in steel bridges
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Applications of infrared thermography for nondestructive testing of fatigue cracks in steel bridges

机译：红外热成像在钢桥疲劳裂纹无损检测中的应用

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In recent years, fatigue crack propagations in aged steel bridge which may lead to catastrophic structural failures have become a serious problem. For large-scale steel structures such as orthotropic steel decks in highway bridges, nondestructive inspection of deteriorations and fatigue damages are indispensable for securing their safety and for estimating their remaining strength. As conventional NDT techniques for steel bridges, visual testing, magnetic particle testing and ultrasonic testing have been commonly employed. However, these techniques are time- and labor- consuming techniques, because special equipment is required for inspection, such as scaffolding or a truck mount aerial work platform. In this paper, a new thermography NDT technique, which is based on temperature gap appeared on the surface of structural members due to thermal insulation effect of the crack, is developed for detection of fatigue cracks. The practicability of the developed technique is demonstrated by the field experiments for highway steel bridges in service. Detectable crack size and factors such as measurement time, season or spatial resolution which influence crack detectability are investigated.
机译：近年来，老化钢桥中的疲劳裂纹扩展可能会导致灾难性的结构破坏，这已成为一个严重的问题。对于大型钢结构，例如公路桥梁的正交异性钢桥面，必须进行无损检查，以确保其安全并评估其剩余强度，以检查其劣化和疲劳损伤。作为用于钢桥的常规无损检测技术，通常使用视觉测试，磁粉测试和超声波测试。但是，这些技术是耗时且费力的技术，因为需要特殊的设备进行检查，例如脚手架或卡车安装的高空作业平台。本文开发了一种新的热成像无损检测技术，该技术基于由于裂纹的绝热作用而出现在结构构件表面的温差，用于检测疲劳裂纹。在役的公路钢桥的现场试验证明了该技术的实用性。研究了可检测的裂纹尺寸和影响裂纹检测能力的因素，例如测量时间，季节或空间分辨率。

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